Container cap

ABSTRACT

An improved bottle cap comprising a closure member adapted to snap over the mouth of a bottle having a peripheral lip, and a locking ring releasably surrounding the closure member to secure it in place. The closure member and the locking ring are provided with cooperating safety lock surfaces which positively lock the two members together. The locking ring may also be provided with radial projections which frictionally engage the bottle neck when the locking ring is released from engagement with the closure member and pushed thereoff.

United States Patent 2,894,654 7/1959 Lohrer 220/38.5

3,145,872 8/1964 Hayes... 220/38.5

3,407,956 10/1968 Linkletter et al. 220/38.5

3,450,290 6/1969 Turner 215/9 FOREIGN PATENTS 267,109 8/1964 Australia215/9 Primary Examiner-William T. Dixson, Jr. Attorney-Fulwider, Patton,Rieber, Lee & Utecht I ABSTRACT: An improved bottle cap comprising aclosure member adapted to snap over the mouth of a bottle having aperipheral lip, and a locking ring releasably surrounding the closuremember to secure it in place. The closure member and the locking ringare provided with cooperating safety lock surfaces which positively lockthe two members together. The locking ring may also be provided withradial projections which frictionally engage the bottle neck when thelocking ring is released from engagement with the closure member andpushed thereoff.

CONTAINER CAIP BACKGROUND OF THE INVENTION 1. Field of the InventionThis invention relates to a novel cap for closing a bottle having aneck, a mouth, and a lip surrounding the mouth of a type which isadapted to snap over the bottle mouth and lip and be locked in place.

2. Description of the Prior Art The present invention constitutes animprovement over the invention set forth in the issued U.S. Pat. No.3,407,956, granted Oct. 29, 1968, entitled BOTTLE CAP. While snaptypeclosures have long been known in the art, the invention of the aforesaidpatent discloses a bottle cap for closing a bottle which has solved manyof the problems inherent in such snaptype closures, such as ease ofoperation, ease and economy of manufacture including the elimination oftolerance problems, and prolonged shelf life. While the aforesaidinvention has met with substantial success, it has become desirable,with the advent of new safety requirements for medicine bottles and thelike, to include a safety lock means for positively securing the closuremember to the locking member to thereby prevent the cap from beingremoved without some preliminary unlocking of the two members. Further,it has become desirable to include some means for retaining the lockingmember around the bottleneck when the locking member has been releasedand pushed off of the closure member to thereby prevent the lockingmember from readily sliding off the bottleneck. The present inventionhas solved the above problems by incorporating a positive safety lockmeans between the closure member and the locking member, and byproviding frictional means adapted to engage the bottleneck to preventthe locking member from readily sliding off the bottle when it has beendisengaged from the closure member.

3 SUMMARY The subject invention provides a radially extending projectionwhich is adapted to engage a cooperating recess to positively lock thelocking member around the depending flange portion of the closure memberto thereby prevent the locking member from being pushed off the closuremember. In the locked position, the closure member is securely clampedto the lip surrounding the bottle mouth such that it may not be removedwithout first unlocking the radial projection from engagement with thecooperating groove and subsequently sliding the locking member off ofthe closure member and onto the bottleneck. By providing a safety lockof this type, with the closure member and the locking member inengagement around the bottle mouth and lip so that a pull on the capsection will not result in opening of the cap, a simple push on thelocking member will not release it from engagement with the closuremember unless the safety lock has first been moved to a releaseposition. Thus, it is impossible for a child to open the bottle capwithout first knowing how to release the safety lock means.

An additional feature of the present invention provides radialprojections on the locking member which are adapted to engage the neckof the bottle upon disengagement with the closure member such that thelocking member will retain its position around the bottleneck and notsimply slide off the neck when the bottle is tilted to remove thecontents thereof. The radial projections carried by the locking memberare designed such that they do not hinder the normal closing and lockingoperation between the closure member and the locking member, and comeinto play only when the locking member has been released from engagementwith the closure member.

It is therefore an object of the present invention to provide animproved snap-type bottle cap which includes a closure member comprisinga cap section and a depending flange section, and a locking memberadapted to surround and engage the flange section of the closure member,which is provided with a positive safety lock means for locking theclosure member in engagement with the locking member, such that it maynot be readily released without first unlocking the lock means.

It is another object of the present invention to provide frictionalmeans carried by the locking member which engage the neck of the bottleupon disengagement with the closure member to thereby restrain thelocking member from sliding off of the bottle upon tilting of the bottleto discharge its contents.

While the term bottle is used throughout the specification forsimplicity, the term is used to include not only glass bottles, but alsosimilar containers, such as molded plastic containers and metalcontainers, which have a peripheral lip surrounding an open mouth and aneck portion extending downwardly from the peripheral lip.

The many features and advantages of the present invention will bepointed out in the following detailed description and claims, andillustrated in the accompanying drawings, which disclose, by way ofexample, the principles of the invention in the best mode which has beencontemplated of applying these principles.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view, partlyin cutaway section, disclosing one embodiment of the lock means of thesubject invention with the closure member locked to the locking member.

FIG. 2 is a top plan view of the bottle cap of FIG. ll.

FIG. 3 is a sectional view of a portion of the bottle cap if FIG. 1,taken along the lines 3-3 of FIG. 2.

FIG. 4 is a bottom plan view of the bottle cap of FIG. ll, taken alongthe lines 4--4 of FIG. ll.

FIG. 5 is a view of the locking projection of the bottle cap of FIG. 1,taken along the lines 55 of FIG. 3.

FIG. 6 is a sectional view of the bottle cap of FIG. ll, illustratingthe positive safety lock in the locked position.

FIG. 7 is a sectional view of the closure cap of the present inventionbefore assembly, illustrating one embodiment of the radial projectionscarried by the locking member which engage the bottleneck when theloclting member is pushed off the closure member.

FIG. 8 is a sectional view similar to FIG. 7, showing the locking memberassembled in position on the bottleneck with the radial projections inengagement therewith.

FIG. 9 is a sectional view of the closure cap of FIG. 7, showing thelocking member assembled in engagement with the closure member.

FIG. 10 is a bottom plan view of the closure cap of FIG. 7, taken alongthe lines lllll0 of FIG. 9.

FIG. 11 is a portion of a perspective view, partly in section, of thelocking member of FIG. 7, taken along the lines Ill-11 of FIG. 7.

FIG. 12 is a perspective view of an. additional embodiment of thesubject invention before assembly, showing another form of radialprojection extending from the locking member for engagement with thebottleneck.

FIG. 13 is a sectional view of the closure cap of FIG. 12, with theclosure member assembled in engagement with the locking member.

FIG. M is a perspective view of :a modified form of the locking memberof the subject invention.

FIG. 15 is a portion of a perspective view, partly in section, of thelocking member of FIG. I4, taken along the lines 15-- IE of FIG. l4.

FIG. 16 is a perspective view of an additional modified form of thelocking member of the subject invention.

FIG. 17 is a perspective view, partly in section, of the locking memberof FIG. l6, taken along the lines I7l7 of FIG. 16.

FIG. 18 is a side elevation, partly in section, illustrating anotherembodiment of the subject invention for locking the closure member tothe locking member.

FIG. 19 is a side elevation, partly in section, illustrating theunlocked condition of the lock means of the closure member of FIG. 18.

FIG. 20 is a side elevation, partly in section, illustrating the removalof the closure member from the bottle mouth lip upon disengagement ofthe locking member of the embodiment illustrated in FIG. 18.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 of the drawingsillustrates a container or bottle having a peripheral lip 11 surroundingthe open mouth thereof, and an outwardly flared neck portion 13extending therefrom. A closure member 12 includes a cap section 16having an outwardly directed radial flange l9 and a downwardly directeddepending flange 20. At the base of the depending flange is a radiallyinwardly directed lip portion 18 which is adapted to underlie the bottlelip 11.

Circumferentially surrounding the depending flange portion 20 of theclosure member 12 is a cylindrical locking member or ring 14. The innersurface of the locking ring 14 is provided with a contact surface 22.The outer surface of the depending flange 20 forms a contact surface 24which is engaged by the inner contact surface 22 of the locking ring 14.The diameters of the two surfaces are such as to provide a close fittherebetween. With the locking ring 14 seated around the closure member12, the depending flange 20 is restrained from outward movement and istherefore securely locked to the bottle 10.

The locking ring 14 is provided with a radially inwardly directedprojection 26 which is seated within a groove 28 carried by thedepending flange portion 20 of the closure member 12. The radialprojection 26 and groove 28 serve as a positive lock for securing theclosure member 12 to the locking ring 14.

A thin flexible strap member 32 may be provided for holding the closuremember 12 to the locking member 14. The flexible strap 32 functions toprevent the closure member 12 from being misplaced or becomingcontaminated by falling on the floor, etc., when the closure member 12has been removed from the'bottle 10. Further, as illustrated in FIGS. 3and 6, a liner or sea] element 33 may be provided on the underside ofthe cap section 16 within the surrounding depending flange 20. Such aseal may be provided whenever it is desirable to have a more positivefluid seal between the upper surface of the mouth of bottle 10 and thclosure member 12. Although a disc-type seal 33 is illustrated, it isapparent that other types of liners or seals can equally be used.

In the preferred construction, the entire closure member 12 and lockingring 14 are molded from a single resilient material, such as rubber orplastic. However, the material utilized in the construction of thelocking ring 14 need not be the same as that used for the closure member12.

As illustrated by the phantom lines of FIG. 4, the groove 28 carried bythe depending flange 20 of the closure member 12 may be in the form of acontinuous annular groove extending radially inwardly from the outersurface of the depending flange portion 20. Alternatively, the groove 20can be in the form of one or more small arcuate sections in thedepending flange rather than a continuous annular groove. As illustratedby FIG. 3, an axial slot communicates between the lower surface of thedepending flange portion 20 of the closure member 12 and the groove 28so as to form a T-shaped bayonet-type slot. The function of the slot 30is to allow the radial projection 26 carried by the locking ring 14 toslide therethrough for communication with the groove 28 carried by theclosure member 12.

As illustrated by the phantom lines of FIG. 3, when it is desired toplace the closure cap 12 onto the bottle 10, the locking ring 14 islocated about the neck portion 11 of the bottle, and the closure cap 14is pushed downwardly, as illustrated by the arrow 34, until it assumesthe position as shown by the solid lines of FIG. 3. Upon seating of theclosure member 12 about the mouth of the bottle 10, the radiallyprojecting lip 18 is fully seated below the bottle lip 11. At this time,the locking ring 14 is aligned such that the radial projection 26carried thereby is axially aligned with the axial slot 30 carriedthereby by the closure member 12, and is then moved upwardly, asillustrated by the arrow 36, until the upper portion of the lockingmember 14 abuts the outwardly directed flange 19 of the closure member12 and assumes the position illustrated by the solid lines. At thistime, the closure member 12 is rotated relative to the locking ring 14so that the radial projection 26 moves along the groove 28 and out ofalignment with the axial slot 30. This results in the complete lockingof the closure member 12 with the locking ring 14, and the locking ring14 may not be pushed off of the closure member 12 without againrealigning the radial projection 26 with the axial slot 30. The lockingsequence is illustrated by the arrow 38 of FIG. 2, and the resultantposition is illustrated by FIG. 6 of the drawings, which shows thelocking ring 14 engaged with the closure member 12 and the projection 26seated fully within the groove 28.

As further illustrated by FIG. 2, an arrow 40 or other means may beimprinted or carried on the top of the closure member 12 with acorresponding mark 41 carried by the locking member 14 to indicate atwhich rotational point the axial slot 30 will be aligned with the radialprojection 26. As illustrated by FIGS. 2 and 4, the locking ring 14 willpreferably include a plurality of circumferentially spaced projections26 and a corresponding number of axial slots 30 carried by the closuremember 12. By providing a plurality of radial projections 26 and axialslots 30, the locking ring 14 is securely locked to the closure member12 at several points around the circumference and may not be readilyunlocked without some knowledge of the precise alignment necessary toalign the radial projections 26 with the axial slots 30.

As illustrated in FIG. 5, the radial projection 26 carried by thelocking ring 22 may be in the form of a cylindrical projection, althoughit is apparent that any other geometric configuration could readily beused as an equivalent thereof. Further, although the specificillustration of this embodiment utilizes a radial projection carried bythe locking ring 14 and the groove 28 and slot 30 carried by the closuremember 12, the parts can be reversed so that the radial projection isoutwardly extending from the depending flange portion 20 of the closuremember 12, and the axial groove extends from the upper surface of thelocking ring 14 to a circumferential outwardly directed groove carriedby the inner surface of the locking ring 14.

Turning to FIG. 7 of the drawings, the locking ring 14 may also beprovided with a radially inwardly projecting member 42 which may, in oneform, be a cutout portion of the inner wall 22 of the locking ring 14.As illustrated in FIG. 8, with the locking ring 14 in its disengagedposition adjacent the bottleneck 13, the projection 42 extends radiallyinwardly and frictionally engages the bottleneck 13. The locking ring 14may be initially inserted over the bottle lip 11 by merely holding theradial projection 42 flush with the inner surface 22 of the locking ring14 and slipping it over the bottle lip 11. When the bottle closuremember 12 is snapped onto the bottle 10, the locking ring 14 may then bemoved upwardly to its seated position illustrated in FIG. 9. In thisposition, the radial projections 42 are forced radially outwardly intothe inner surface 22 of the locking ring 14 so that the inner surface22' is flush with the contact surface 22. Upon pushing the locking ring14 downwardly out of engagement with the closure member 12, the inherentresiliency of the projection 42 will cause it to flex radially inwardlyto again contact the bottleneck 13. By providing a plurality of suchradial projections spaced around the locking ring 14, sufficientfrictional force may be developed to hold the locking ring in positionon the neck 13 of bottle 10 when the bottle is tipped to empty thecontents therefrom.

As illustrated in FIG. 10, three such projections 42 have been providedin the preferred embodiment, although it is ap parent that any number orgeometrical configuration can be utilized.

The locking ring 14 of FIGS. 7-11 will preferably be provided withradial projections 26 as discussed above with reference to FIGS. 1-6.The radial projections 26 can extend from the contact surface 22 atpoints circumferentially spaced from the flexible radial projections 42so as not to interfere therewith. In this manner, the closure cap isprovided not only with a positive safety lock means, but the lockingring 14 also includes frictional projections 42 which engage the neck 13of the bottle 10 after disengagement with the closure member 12.

FIG. 12 illustrates the second embodiment of the radial projectioncarried by the locking ring 14 for frictionally engaging the bottleneck13 upon release of the closure member 12 from the locking ring 14. Inthis embodiment of the invention, the radial projection may take theform of an inwardly directed cylindrical flange 48 extending from thebottom portion of the locking ring 14. The flange 48 may be moldedintegral with the lower portion of the locking ring14 or, alternatively,can be formed from a separate piece of material secured to the lowerportion of the locking ring 14. This embodiment of the frictionalgripping means is preferable for use with a bottle 10 having a neck 13of constant diameter, as shown in FIG. 13, although it can be used inconjunction with a bottle 10 having a neck 13 of variable diameter, asshown in FIG. 7, by using a more flexible material for the flange 48.

As is the case with the multiple projection frictional holding means 42discussed in conjunction with FIGS. 7-11, the locking ring 14 and capmember 12 of the embodiment of FIGS. 12-13 may be provided with safetylock means for securely locking the members together when engaged.

FIGS. 14-17 illustrate a modification of the locking ring 14 whichdecreases the amount of material utilized in its manufacture, hencedecreasing the cost thereof, and which allows the locking ring to besubstantially lighter in weight. As illustrated in FIG. 14, the lockingring 14 is provided with a series of recess portions 50 machined ormolded into the inner surface of the locking ring 14. As illustrated inFIGS. 14 and 15, the recesses 50 may be formed to extend from the uppersurface of the locking ring 14 to a point adjacent the lower surfacethereof, or, alternatively, as illustrated in FIGS. 16 and 17, therecesses 50 may be machined from the lower surface of the locking ring14 to a point slightly below the upper surface thereof. It has beenfound that these recesses 50 do not substantially detract from thestrength of the locking ring as the flush contact surfaces 22 provideadequate engagement with the corresponding contact surface 24 of thedepending flange of the closure member 12.

The above-discussed modifications can be readily adapted to the lockingrings 14 of FIGS. 1-13 in order to provide a positive lock betweenlocking ring 14 and the closure member 12, and/or provide radial contactsurfaces for engaging the neck 13 of the bottle 10 when the locking ring14 is disengaged from the closure member 12.

In FIGS. 18 20, a modified form of the safety lock means for locking theclosure member 12 to the locking ring 14 is illustrated. In thisembodiment, the locking ring 14 is provided with a groove 56 which hasan undercut lip adjacent the upper outer surface thereof. The closuremember 12 is provided with a radial projection 54 extending radiallyinwardly and downwardly from the outer periphery of the cap portion 52.The projection 54 is adapted to engage the groove 56 of the locking ring14 to thereby lock the closure member 12 to the locking ring 14.

As best seen in FIG. 18, the cap portion 52 is slightly convex whenseated over the mouth of bottle 10. With the closure member 12 locked tothe locking ring 14, should internal pressure be developed within thebottle, the cap section 52 will tend to flex outwardly and hence drawthe radial projection 54 tighter within the groove 56, thus preventingthe closure member from coming off. In order to unlock the radialprojection 54 from engagement with the groove 56, in order to releasethe locking ring 14 so that it may be pushed off the clo' sure member12, it is necessary to depress the cap portion 52 as illustrated in FIG.19 of the drawings. Upon depressing the cap portion 52, as illustratedby the arrow in FIG. 19, the radial projection 54 moves outwardly andupwardly to disengage from the undercut lip of groove 56. The lockingring 14 is then free to be pushed downwardly as illustrated by thephantom lines of FIG. 19, and the closure member 12 may then be removedfrom the top of the bottle 10..

In order toreseal the bottle, the closure member 12 is positioned overthe opening of bottle 10, and pressure is applied to the center of thecap section 52 as the depending flange 20 and the associated projectinglip 18 snap into place under the bottle lip ll 1. The lockingring 14 isthen moved upwardly over the depending flange 20 until it is fullyseated therearound. Thereupon, the pressure is released from the centerof the cap portion 52, allowing the cap portion 52 to flex outwardly andbring the radial projection 54 into engagement with the groove 56 tothereby positively lock the two members together.

The locking ring 14 may be readily provided with inwardly directedradial projections, similar to that set forth in conjunction with thediscussion above of FIGS. 743, and can also be provided with cutoutportions as discussed in conjunction with FIGS. 14-17, for the purposeof decreasing cost of manufacture and weight. If it is desired to have amultiple lock means for securing the closure cap in position on thebottle, the safety lock means of FIGS. 1-6 can also be incorporated intothe cap structure of FIGS. lfl-ZII.

From the foregoing, it will be seen that the safety lock means of FIGS.1- 6 or FIGS. 18-20 provide a positive lock for preventing removal ofthe closure cap without first unlocking the closure member from thelocking ring. Further, if it is desired to have a double-lock feature,the safety lock means of FIGS. 1-6 can be combined with the safety lockmeans of FIGS. 18-20. With this lock structure, two unlocking operationswould be necessary. It would first be necessary to depress the convextop portion 52 of the closure member 12 to release the radial projection54 from the groove 56 of the locking ring 14, then align the radialprojection 26 carried by the locking ring 14 with the axial slot 30carried by the depending flange 20 of the closure member 12, and thensubsequently push the locking ring 14 downwardly out of engagement withthe closure member 12.

Further, by incorporating radial projections such as illustrated in theembodiments of FIGS. 7-11, or embodiments illustrated in FIGS. 12-13 inthe locking ring 14, the locking ring may be retained on the bottleneck13 after disengagement with the closure member 12 to thereby prevent thelocking ring 14 from sliding off the bottle 10 when it is tipped todischarge its contents.

In order to provide economy of manufacture and reduction of closure capweight, the modified locking ring structure of FIGS. 14-17 may also beemployed.

Thus, the present invention provides an improved closure cap for usewith the bottle having a neck portion terminating in an outwardlydirected bottle lip, which will prevent removal of the closure cap byone unfamiliar with its operation. Further, the present inventionprovides means for insuring that the locking ring will retain itsposition on the bottle, even though the bottle is turned from thevertical. While the particular discussion above has been directed to thepreferred embodiments of this invention, it is obvious thatmodifications and variations therein may be effected withoutsubstantially departing from the spirit and scope of the novel conceptsof this invention as set forth by the following claims.

Iclaim:

1. A container cap for closing a container having a mouth with asurrounding rim that includes a peripheral lip and a depending neck,said container cap comprising:

a closure member including a cap section overlaying the mouth of thecontainer, and having a convex curvature and an outwardly projectingradial flange, a depending flange projecting downwardly from said capsection, a lip projecting inwardly from one side of said dependingflange, and a contact surface on the outside of said depending flange;an annular locking member including an inner contact surface soproportioned and arranged as to surround said depending flange so thatthe contact surfaces engage each other and hold said lip of saiddepending flange inwardly laterally beneath the lip of the container,said outwardly projecting radial flange extending radially beyond saidinner contact surface of said annular locking member;

and a positive safety lock means releasably locking said memberstogether against relative axial movement when in engagement, said lockmeans including a groove adjacent the upper outer surface of saidlocking member, and a projection extending radially inwardly from theperipheral edge of said outwardly projecting radial flange of said capsection and engaging said groove to couple said closure member with saidlocking member, said closure member being releasable by applyingdownward pressure to said cap section to move said radial projectionsoutwardly and release from engagement with said groove to unlock saidlock means, and pushing the locking member downwardly off the closuremember and onto the neck of the container.

2. A container cap as in claim 1 wherein said locking member is providedwith a radial flange on its inner periphery adapted to frictionallyengage the neck of said container when said member is pushed off saidclosure member.

3. A container cap as in claim 2 wherein said radial flange comprises atleast one yieldable projection forming a portion of said contact surfacewhen said closure member is engaged with said locking member and adaptedto flex radially inwardly upon disengagement.

4. A container cap as in claim 2 wherein said radial flange comprises aradially inwardly directed annular lip adjacent the lower surface ofsaid locking member.

5. A container cap as in claim 1 wherein said safety lock means furthercomprises at least one radially extending projection carried by saidlocking member and a recess carried by said closure member adapted toreceive said projection.

6. A container cap as in claim 5 wherein at least two circumferentiallyspaced radial projections are carried by said locking member and atleast two cooperating bayonet slots are carried by said closure member.

7. A container cap as in claim 6 wherein said locking member is providedwith a radial flange adapted to frictionally engage the neck of saidcontainer when said member is pushed off said closure member.

8. A container cap as in claim 7 wherein said locking member is modifiedby a plurality of recessed portions formed around the contact surfacethereof.

9. A container cap as in claim 1 wherein a flexible member interconnectssaid closure member and said locking member and a seal element iscarried by said cap section on the underside thereof.

10. In a container cap for closing a container having a mouth with asurrounding rim that includes a peripheral lip and a depending neck ofthe type comprising:

a closure member including a cap section adapted to overlay the mouth, adepending flange projecting from the cap section, a lip projectinginwardly from one side of the depending flange, and a contact surface onthe other side of the flange;

and an annular locking member including an inner contact surface soproportioned and arranged as to surround the neck and the dependingflange so that the contacting surfaces engage each other and hold thelip of the depending flange inwardly laterally beneath the lip of thecontainer, the cap being releasable by pushing the locking member offthe closure member and onto the neck of the bottle,

the irn rovement comprising: a pluralr y of crrcumferentrally spacedyreldable pro ections extending from said contact surface of saidlocking member such that said projections form a portion of said contactsurface when said closure member is engaged with said locking member,and flex radially inwardly upon disengagement of said members thereby tofrictionally engage the neck of said container when said member ispushed off of said closure member.

11. An improved container cap as in claim 10 wherein said locking memberis modified by a plurality of recessed portions formed around thecontact surface.

12. An improved container cap as in claim 11 wherein said recessesextend axially from the lower face of said member to a point below theupper face thereof.

13. An improved container cap as in claim 11 wherein said recessesextend axially from the upper face face thereof.

1. A container cap for closing a container having a mouth with asurrounding rim that includes a peripheral lip and a depending neck,said container cap comprising: a closure member including a cap sectionoverlaying the mouth of the container, and having a convex curvature andan outwardly projecting radial flange, a depending flange projectingdownwardly from said cap section, a lip projecting inwardly from oneside of said depending flange, and a contact surface on the outside ofsaid depending flange; an annular locking member including an innercontact surface so proportioned and arranged as to surround saiddepending flange so that the contact surfaces engage each other and holdsaid lip of said depending flange inwardly laterally beneath the lip ofthe container, said outwardly projecting radial flange extendingradially beyond said inner contact surface of said annular lockingmember; and a positive safety lock means releasably locking said memberstogether against relative axial movement when in engagement, said lockmeans including a groove adjacent the upper outer surface of saidlocking member, and a projection extending radially inwardly from theperipheral edge of said outwardly projecting radial flange of said capsection and engaging said groove to couple said closure member with saidlocking member, said closure member being releasable by applyingdownward pressure to said cap section to move said radial projectionsoutwardly and release from engagement with said groove to unlock saidlock means, and pushing the locking member downwardly off the closuremember and onto the neck of the container.
 2. A container cap as inclaim 1 wherein said locking member is provided with a radial flange onits inner periphery adapted to frictionally engage the neck of saidcontainer when said member is pushed off said closure member.
 3. Acontainer cap as in claim 2 wherein said radial flange comprises atleast one yieldable projection forming a portion of said contact surfacewhen said closure member is engaged with said locking member and adaptedto flex radially inwardly upon disengagement.
 4. A container cap as inclaim 2 wherein said radial flange comprises a radially inwardlydirected annular lip adjacent the lower surface of said locking member.5. A container cap as in claim 1 wherein said safety lock means furthercomprises at least one radially extending projection carried by saidlocking member and a recess carried by said closure member adapted toreceive said projection.
 6. A container cap as in claim 5 wherein atleast two circumferentially spaced radial projectionS are carried bysaid locking member and at least two cooperating bayonet slots arecarried by said closure member.
 7. A container cap as in claim 6 whereinsaid locking member is provided with a radial flange adapted tofrictionally engage the neck of said container when said member ispushed off said closure member.
 8. A container cap as in claim 7 whereinsaid locking member is modified by a plurality of recessed portionsformed around the contact surface thereof.
 9. A container cap as inclaim 1 wherein a flexible member interconnects said closure member andsaid locking member and a seal element is carried by said cap section onthe underside thereof.
 10. In a container cap for closing a containerhaving a mouth with a surrounding rim that includes a peripheral lip anda depending neck of the type comprising: a closure member including acap section adapted to overlay the mouth, a depending flange projectingfrom the cap section, a lip projecting inwardly from one side of thedepending flange, and a contact surface on the other side of the flange;and an annular locking member including an inner contact surface soproportioned and arranged as to surround the neck and the dependingflange so that the contacting surfaces engage each other and hold thelip of the depending flange inwardly laterally beneath the lip of thecontainer, the cap being releasable by pushing the locking member offthe closure member and onto the neck of the bottle, the improvementcomprising: a plurality of circumferentially spaced yieldableprojections extending from said contact surface of said locking membersuch that said projections form a portion of said contact surface whensaid closure member is engaged with said locking member, and flexradially inwardly upon disengagement of said members thereby tofrictionally engage the neck of said container when said member ispushed off of said closure member.
 11. An improved container cap as inclaim 10 wherein said locking member is modified by a plurality ofrecessed portions formed around the contact surface.
 12. An improvedcontainer cap as in claim 11 wherein said recesses extend axially fromthe lower face of said member to a point below the upper face thereof.13. An improved container cap as in claim 11 wherein said recessesextend axially from the upper face face thereof.